Gets or sets the index of the selected row in a System.Web.UI.WebControls.GridView control.
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Use the GridView.SelectedIndex property to determine the index of the currently selected row in a System.Web.UI.WebControls.GridView control. You can also use this property to programmatically select a row in the control. To clear the selection of a row, set this property to -1. The appearance of the currently selected row can be customized by using the GridView.SelectedRowStyle property. To access the currently selected row, use the GridView.SelectedRow property.